Electropneumatic brake apparatus.



W. v. Tummy ElECHOPf-JEUMATIC BRAKE APPARATUS. APPLICADON FELEU JULY l0, 1914.

www Def-.28,1915

2 SHEETS-SHEET 1.

.IJITNESSES INVENTOR W. V. TURNER. ELECTROPNEUMATIC BRAKE APPARATUS.

APPLICATlON FILED IULY l0, 1914.

2 SHEETSA-SHEET 2.

Patented Dec. 28, 1915.

W VT N E S S E S f l narra' eraan ramena onirica WALTER V. TURNER, OF EDGEWOOD, PENNSYLVANIA. ASSIG-NOR T THE WESIING- lHOUSE AIR BRAKE COMPANY, OF WILMERDING, PENNSYLVANIA, A CORPORATION or PENNSYLVANIA;

ELECTROPNEUMATIC BRAKE All-PARATUS.

Specification of Letters Patent.

Patented Dec.. 2%, 1915.

Application filed .T'xly 10, 1914. Serial No. 850,173.

T0 all whom it may concern Be it known that I, WALTER V. TURNER, a citizen of the United States, residing at Edgewood, inthe county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Electropneumatic Brake Apparatus, `of which the following is a specification.

This invention relates tofluid pressure brakes, and more particularly to a brake apparatus having electrical means for effecting reductions in brake pipe pressure. l

My invention has reference more particularly to an automatic valve device operating upon a reduction in brake pipe pressure for effecting an applic-ation of the brakes and in which an electro-magnet controlled valve is 'employed for venting -fiuid from the brake pipe.

With the above type of brake apparatus, the passages through which the magnet valve ventsl fluid from the brake pipe are `so restricted that the maximum rate of reduction in brake pipe pressure which may be effected by the opening of the magnet valve is limited in order to prevent such aA there is liable to be leakage from the brake` pipe in addition to the venting of fluid therefrom-by the action of the magnet valve so that the combined eiect of the brake pipe leakage and the magnet valve venting may be sufficient to cause movement of the automatic valve device to emergency position.

In order to obviate the above difliculty, the principal object of my inventio-n is to provide improved means for limiting the rate of reduction in brake pipe pressure upon operation of the magnet vent valve.

In the accompanying drawings; Figure 1 is'a sectional view of'an electro-pneumatic brake apparatusembodying myimprovement and showing the automaticA valve device in normal release position and Fig. 2 a similar view, showing the' parts in electric service application position.

My invention is adapted to be employed in connection with various more or less complex valve devices designed for use on electric traction and steam roads, but to illustrate a simple application of the invention,

the drawings merely show an ordinary triple valve device and a magnet controlled valve for venting fluid from the brake pipe.

The triple valve device comprises the usual casing 1 having a piston chamber 2 containing piston 3 connected to brake pipe -l and valve chamber 5l open to the auxiliary reservoir Gand containing main slide valve 7 and auxiliary valve 8 adapted to be operated by piston 3.

Brake cylinder 9 `is connected by pipe 10 to passage 11 containing a choke plug 12 and a port 13 in the mainslide valve seat opens into said passage. i`

The electric release may be controlled by a magnet 14 and valve 15 of the usual type having a release passage 16 leading to the triple valve exhaust port 17.

The electric service may be controlled by a. magnet 18 adapted to operate a valve 19 which governs communication from a passage 20, leading to the brake pipe volume, to a vent passage 2l containing a non-return check val-ve 22.

According to my invention, the ventA passage 21 leads to passage 11 on that side of the choke 12 away from the brake cylinder, so that fluid vented from the brake pipe flows through the choke to the brake Cylin- By this arrangement, the rate of redei'. duction in brake pipe pressure through the opening of the service magnet valve cannot exceed the rate at which fluid flows from the auxiliary reservoir to the brake cylinder, since fluid from both the brake pipe and the auxiliary reservoir must fiow through the choke plug 12. As a consequence, if there is brake pipe leakage, the increased reduction in brake pipe pressure thus produced will tend to effect an increased flow of fluid from the auxiliary reservoir and to correspondingly reduce the flow from the brake pipe past the service magnet valve. 1n fact, the brake pipe pressure may be less than the pressure in passage 11 on the side of the choke remote from opened, so that the llo'iv from the auxiliary reservoir to the brake cylinder is reduced, thus'permitting a corresponding increase in the rate of flow from the brake pipe to the brake cylinder.

The size of the restricted ,port through the cliokelQ is preferably such as tov give the desired predetermined rate of flow from the auxiliary reservoir to the brake cylinder, and since the rate of reduction in brake pipe pressure cannot exceed this rate, possible movement of the triple or other automatic valve to emergency position in service applications by excessive reductions in brake pipe pressure is prevented.

Having now described my invention, what I claim as new and desire to secure by Let* ters Patent, is: v

1. In a fluid pressure brake, the combination \vi th`a brake pipe and an automatic valve device operated upon a reduction in brake pipe pressure for supplying fluid to the brake cylinder through a restricted port, of electrically controlled means for venting .fluid from the brake pipe through said port.

. 2. In a fluid pressure brake, the combination with a brake cylinder, a brake pipe, a choke plug and an automatic valve device operated upon a reduction in brake pipe pressure for supplying fluid to the brake cylinder through said choke plug, of electrically controlled means for venting fluid from the brake pipe through a restricted port to the brake cvlindei".

3. 'In a fluid pressure brake, the combination with a brake cylinder, brake pipe, reservoir,and a valve device operated upon a reduction in brake pipepressure forsupplying fluid from the reservoir through a restricted portkto the brake cylinder, of electrically controlled means for venting Huid from -thebrake pipe to the brake cylinder :tion with a brake cylinder, brake pipe, reservoir, and a valve device having a choke plug with a restricted port and operated upon a Areduction inV brake pipe pressure for supplying fluid from said reservoir through said restricted port to the brake cylinder, of

electrically "controlled means for venting fluid from the brakepipe'to the brake cylinder through said restricted port,x and a check valve for preventing back flow through said electrically control-led means to the brake pipe.

ln testimony whereofl I have hereunto set my hand.

lVALTER V. TURNER. lVitnesses:

A. M. CLEMENTS, S. lV. KEEFER. 

